National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Thunderstorm Light Rain Fog/Mist

73°F

23°C

Humidity 90%
Wind Speed S 12 G 21 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 70°F (21°C)
Visibility 6.00 mi
Last update 27 Aug 3:56 pm EDT
Extended Forecast for

Central Islip NY

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South wind around 13 mph.

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 70. South wind 6 to 9 mph.

    Low: 70 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 11am. Partly sunny, with a high near 82. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 66. Light and variable wind becoming north 5 to 8 mph after midnight.

    Low: 66 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 81. North wind 3 to 6 mph.

    High: 81 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 83.

    High: 83 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81. South wind around 13 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 70. South wind 6 to 9 mph.
Friday
A 30 percent chance of showers and thunderstorms after 11am. Partly sunny, with a high near 82. Calm wind becoming southwest around 6 mph in the afternoon.
Friday Night
A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, with a low around 66. Light and variable wind becoming north 5 to 8 mph after midnight.
Saturday
Mostly sunny, with a high near 81. North wind 3 to 6 mph.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 82.
Sunday Night
Partly cloudy, with a low around 69.
Monday
Partly sunny, with a high near 83.
Monday Night
Mostly cloudy, with a low around 68.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 81.
Tuesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 80.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 67.
Thursday
A chance of showers. Partly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Central Islip NY
 40.79°N 73.2°W (Elev. 98 ft)
Last Update:
1:43 pm EDT Aug 27, 2026
Forecast Valid:
4pm EDT Aug 27, 2026-6pm EDT Sep 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation